i386: Do not use %ecx DRAP for functions that use __builtin_eh_return [PR104362]
Commit Message
%ecx can't be used for both DRAP register and eh_return. Adjust find_drap_reg
to choose %edi for functions that uses __builtin_eh_return to avoid the assert
in ix86_expand_epilogue that enforces this rule.
2022-02-03 Uroš Bizjak <ubizjak@gmail.com>
gcc/ChangeLog:
PR target/104362
* config/i386/i386.cc (find_drap_reg): For 32bit targets
return DI_REG if function uses __builtin_eh_return.
gcc/testsuite/ChangeLog:
PR target/104362
* gcc.target/i386/pr104362.c: New test.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
Pushed to master, will be backported to gcc-11.
Uros.
@@ -7400,7 +7400,8 @@ find_drap_reg (void)
register in such case. */
if (DECL_STATIC_CHAIN (decl)
|| cfun->machine->no_caller_saved_registers
- || crtl->tail_call_emit)
+ || crtl->tail_call_emit
+ || crtl->calls_eh_return)
return DI_REG;
/* Reuse static chain register if it isn't used for parameter
new file mode 100644
@@ -0,0 +1,24 @@
+/* PR target/104362 */
+/* { dg-do compile } */
+/* { dg-options "-mavx512f" } */
+
+struct _Unwind_Context
+{
+ void *ra;
+ char array[48];
+};
+
+extern long uw_install_context_1 (struct _Unwind_Context *);
+
+void
+_Unwind_RaiseException (void)
+{
+ struct _Unwind_Context this_context, cur_context;
+ __builtin_memset(&this_context, 55, sizeof(this_context));
+ long offset = uw_install_context_1 (&this_context);
+ __builtin_memcpy (&this_context, &cur_context,
+ sizeof (struct _Unwind_Context));
+ void *handler = __builtin_frob_return_addr ((&cur_context)->ra);
+ uw_install_context_1 (&cur_context);
+ __builtin_eh_return (offset, handler);
+}